Abstract
The microstructures and erosion–corrosion properties of boron-bearing stainless steel were researched by an erosion–corrosion tester, energy dispersive X–ray spectrometry, scanning electron microscope and X-ray diffraction analysis. The microstructures of as-cast, boron-bearing stainless steel contain M7(B,C)3, M2(B,C) borocarbides and the martensite matrix; the matrix has less chromium and more nickel than those in the M2(B,C) and M7(B,C)3. The microstructures in heat-treated, boron-bearing stainless steel consist of M7(B,C)3, M2(B,C) and M23(B,C)6 borocarbides and ferrite, and the Rockwell hardness of heat-treated, boron-bearing stainless steel is lower than that of as-cast steel. For Cr28 white cast iron and boron-bearing stainless steel, the mixing wheel with higher rotating speed leads to a higher erosion–corrosion weight loss, and as the impingement angle increases, the erosion–corrosion weight loss increases first, and then decreases. For any erosion–corrosion experiment conditions, the erosion–corrosion resistance of boron-bearing stainless steel is better than that of Cr28 white cast iron.
Highlights
Slurry pump impellers, turbine runners, pipelines, etc., have been eroded and corroded by corrosive media for a long time [1,2,3,4,5,6]
The corrosion resistance of high-chromium cast iron is enhanced by the chromium element, so that these cast irons can be used in corrosive wear conditions [17]
The results showed that the inter-phase corrosion between the carbide and matrix in chromium white cast iron caused serious injury to the matrix and made the carbides exposed in strong acidic media conditions
Summary
Turbine runners, pipelines, etc., have been eroded and corroded by corrosive media for a long time [1,2,3,4,5,6]. The results showed that the inter-phase corrosion between the carbide and matrix in chromium white cast iron caused serious injury to the matrix and made the carbides exposed in strong acidic media conditions. The carbides must be broken by flow slurry, which drastically reduced the erosion and corrosion resistance for the chromium white cast iron. Fu et al [22] studied the microstructures and mechanical properties of austenitic stainless steel containing the B element under different austenitizing temperatures. Zhang et al [27] investigated the microstructures and abrasion wear performance of the Fe-B alloy under a hot forging process It could be seen from the results that the hardness and toughness of the unforged samples were both lower than those of the forged samples. Based on the above research results, the microstructures and erosion–corrosion property of boron-bearing stainless steel were studied, and the erosion–corrosion mechanism was researched
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